Acoustic wave energy fluxes for late-type stars.

Details Acoustic wave energy fluxes for late-type stars. Acoustic wave energy fluxes for late-type stars.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315..212u&link_type=abstract

Astronomy and Astrophysics, v.315, p.212-221

Astronomy and Astrophysics

Astrophysics

48

Acoustic Waves, Stars: Convection Zone, Stars: Chromosphere, Stars: Hrd

Scientific paper

We revisit the problem of acoustic wave generation by turbulent convection in late-type stellar atmospheres. Using the Lighthill-Stein theory with modifications described in our recent paper Musielak et al. (1994ApJ...423..474M), we compute both acoustic frequency spectra and total acoustic fluxes on basis of grey LTE mixing-length convection zone models for population I stars, in the range of effective temperatures T_eff_=2000-10000K and gravities logg=0-8. The turbulent flow field is represented by an extended Kolmogorov spatial and modified Gaussian temporal energy spectrum. The mixing-length parameter was varied in the range α=1-2. Particularly for M-dwarf stars we find large discrepancies between our fluxes and those of Bohn (1981 (Ph.D. Thesis, Univ. Wuerzburg, Germany), 1984A&A...130..202B). Except for very cool dwarf stars our total fluxes are well reproduced by the simple Lighthill-Proudmann formula already developed in the 1950's.

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